diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26ea0749..97e1b7f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Added
+
+- Uplynk
+  - Added `orderedPreplayParameters` to `UplynkSSAIConfiguration`, which can be used to maintain the order of preplay parameters when making a request.
+
+### Fixed
+
+- Uplynk
+  - Improved URL encoding for characters such as `%`, `&`, `=`, `+` and `,` to preserve pre-encoded values and prevent server-side double decoding issues.
+
+### Changed
+
+- Uplynk
+  - When ping feature is not configured, the player will now send an empty string instead of `"&ad.pingc=0"` to prevent unsigned parameters that could break signature validation.
+
 ## [10.8.0.1] - 2026-01-20
 
 ### Fixed
diff --git a/Code/Uplynk/Source/Internal/UplynkSSAIConfiguration+Extensions.swift b/Code/Uplynk/Source/Internal/UplynkSSAIConfiguration+Extensions.swift
index fab531df..aa80ca3a 100644
--- a/Code/Uplynk/Source/Internal/UplynkSSAIConfiguration+Extensions.swift
+++ b/Code/Uplynk/Source/Internal/UplynkSSAIConfiguration+Extensions.swift
@@ -14,6 +14,19 @@ extension UplynkSSAIConfiguration {
     }
     
     var urlParameters: String {
+        if let orderedParams = orderedPreplayParameters, !orderedParams.isEmpty {
+            // Define strict allowed characters for query values
+            // We MUST encode '%' (to preserve pre-encoded values), '&', '=', '+', and others that alter URL structure.
+            var allowed = CharacterSet.urlQueryAllowed
+            allowed.remove(charactersIn: "&+=?%,")
+            
+            let joinedParameters = orderedParams.map { (key, value) in
+                let encodedValue = value.addingPercentEncoding(withAllowedCharacters: allowed) ?? value
+                return "\(key)=\(encodedValue)"
+            }.joined(separator: "&")
+            return "&\(joinedParameters)"
+        }
+        
         guard !preplayParameters.isEmpty else {
             return ""
         }
@@ -31,9 +44,9 @@ extension UplynkSSAIConfiguration {
     var pingParameters: String {
         let pingFeature = pingFeature
         if pingFeature == .noPing {
-            return "&ad.pingc=0"
+            return ""
         } else {
-            return "&ad.pingc=1&ad.pingf=\(pingFeature.rawValue)"
+            return "&ad.cping=1&ad.pingf=\(pingFeature.rawValue)"
         }
     }
     
diff --git a/Code/Uplynk/Source/UplynkSSAIConfiguration.swift b/Code/Uplynk/Source/UplynkSSAIConfiguration.swift
index 62cd2dd6..7a21c797 100644
--- a/Code/Uplynk/Source/UplynkSSAIConfiguration.swift
+++ b/Code/Uplynk/Source/UplynkSSAIConfiguration.swift
@@ -27,6 +27,7 @@ public class UplynkSSAIConfiguration: CustomServerSideAdInsertionConfiguration {
     public let id: ID
     public let prefix: String?
     public let preplayParameters: [String: String]
+    public let orderedPreplayParameters: [(String, String)]?
     public let assetType: AssetType
     public let contentProtected: Bool
     public let assetInfo: Bool
@@ -38,6 +39,7 @@ public class UplynkSSAIConfiguration: CustomServerSideAdInsertionConfiguration {
         assetType: AssetType,
         prefix: String? = nil,
         preplayParameters: [String: String] = [:],
+        orderedPreplayParameters: [(String, String)]? = nil,
         contentProtected: Bool = false,
         assetInfo: Bool = false,
         uplynkPingConfiguration: UplynkPingConfiguration = .init(),
@@ -47,6 +49,7 @@ public class UplynkSSAIConfiguration: CustomServerSideAdInsertionConfiguration {
         self.assetType = assetType
         self.prefix = prefix
         self.preplayParameters = preplayParameters
+        self.orderedPreplayParameters = orderedPreplayParameters
         self.contentProtected = contentProtected
         self.assetInfo = assetInfo
         self.pingConfiguration = uplynkPingConfiguration
diff --git a/Code/Uplynk/Tests/UplynkSSAIConfigurationURLBuilderTests.swift b/Code/Uplynk/Tests/UplynkSSAIConfigurationURLBuilderTests.swift
index 542b24e2..8c1d4277 100644
--- a/Code/Uplynk/Tests/UplynkSSAIConfigurationURLBuilderTests.swift
+++ b/Code/Uplynk/Tests/UplynkSSAIConfigurationURLBuilderTests.swift
@@ -63,8 +63,8 @@ final class UplynkSSAIConfigurationURLBuilderTests: XCTestCase {
         let prefix = "https://content.uplynk.com"
         let assetID = "a123"
         
-        let validNoPingQueryParameter = "ad.pingc=0"
-        let validPingQueryParameter = "ad.pingc=1&ad.pingf=\(pingFeature.rawValue)"
+        let validNoPingQueryParameter = ""
+        let validPingQueryParameter = "ad.cping=1&ad.pingf=\(pingFeature.rawValue)"
         
         let pingConfiguration = switch pingFeature {
         case .noPing:
diff --git a/Code/Uplynk/docs/preplay.md b/Code/Uplynk/docs/preplay.md
index 28b87cfc..c3d18649 100644
--- a/Code/Uplynk/docs/preplay.md
+++ b/Code/Uplynk/docs/preplay.md
@@ -33,6 +33,8 @@ We start by creating an `UplynkSSAIConfiguration` object that describes how to c
  
 - `preplayParameters`: The `preplayParameters` object should have string-key-string-value combinations, which will be used as query parameters for the Preplay API call. Nested objects are not supported.
 
+- `orderedPreplayParameters`: The `orderedPreplayParameters` object should have string-key-string-value combinations, which will be used as query parameters for the Preplay API call. Nested objects are not supported. Unlike `preplayParameters`, `orderedPreplayParameters` preserves the order of parameters while making a request, which is neccessary to prevent unsigned parameters that could break signature validation.
+
 - `contentProtected`: Boolean value which will internally set any necessary content-protection information. No content-protection details have to be specified by the customer.
 
 - **A Preplay request must include all parameters defined within the playback request, hence these parameters must be included in the THEOplayer source**. This request must also include a digital signature if the 'Require a token for playback' option is enabled in the back-end on the corresponding live channel. (See also : [Signing a Playback URL Tutorial](https://docs.uplynk.com/docs/sign-playback-url))
@@ -62,7 +64,7 @@ Ad specific parameters can be passed in the `preplayParameters` argument of the
                                 assetType: ...,
                                 prefix: ..., 
                                 preplayParameters: [
-                                    // Parameters here should specify the necessary ad parameters for the Preplay API
+                                    // Parameters here should specify the necessary ad parameters for the Preplay API. Use `orderedPreplayParameters` instead to pass these in the order given.
                                     "ad.param1": "param_val1",
                                     "ad.param2": "param_val2" 
                                 ],